Revert the roll of co19.

tests/co19/co19-co19.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains the tests that have been identified as broken and
 # have been filed on the co19 issue tracker at
 #    https://code.google.com/p/co19/issues/list (read-only).
 #    https://github.com/dart-lang/co19/issues .
 #
 # In order to qualify here these tests need to fail both on the VM and dart2js.
 
 ### GENERAL FAILURES ###
 
 [ $runtime == vm || $runtime != vm ]
 # Tests that fail everywhere, including the analyzer.
 
+Language/Classes/Constructors/Constant_Constructors/initializer_not_a_constant_t01: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/initializer_not_a_constant_t02: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/initializer_not_a_constant_t03: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/not_a_constant_in_superclass_t01: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/not_a_constant_in_superclass_t02: Pass, Fail, OK # co19 issue 18
+
+# Super is now allowed in mixins and mixins may now extend a subclass of Object.
+Language/09_Mixins/09_Mixins_A01_t01: Skip # co19 issue 9.
+Language/09_Mixins/09_Mixins_A03_t01: Skip # co19 issue 9.
+
+# No longer correct, y#$ now has a meaning. github.com/dart-lang/co19/issues/2
+Language/12_Expressions/30_Identifier_Reference_A01_t03: Skip
+
 LibTest/typed_data/ByteData/buffer_A01_t01: Fail # co19 r736 bug - sent comment.
 
 LibTest/core/RegExp/firstMatch_A01_t01: Fail # co19 issue 742
 
+# These tests are obsolete and need updating.
+WebPlatformTest/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-attributes/test-002_t01: Skip # Issue 19019
+WebPlatformTest/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-attributes/test-003_t01: Skip # Issue 19019
+
+# These tests are broken in both Javascript and Dart (co19 folks contacted to fix).
+WebPlatformTest/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-methods/test-004_t01: Skip # Issue 21115
+
 [ $compiler != dart2analyzer ]
 # Tests that fail on every runtime, but not on the analyzer.
 
 LibTest/async/Future/Future.error_A01_t01: RuntimeError # co19 issue 712
 LibTest/async/Completer/completeError_A02_t01: RuntimeError # co19 issue 712
 LibTest/isolate/ReceivePort/asBroadcastStream_A02_t01: Fail # co19 issue 687
 LibTest/async/Stream/asBroadcastStream_A02_t01: Fail # co19 issue 687
 
 LibTest/core/Symbol/Symbol_A01_t04: RuntimeError # Issue 25804
 
 Language/Classes/same_name_type_variable_t01: Pass, MissingCompileTimeError, Fail # Issue 14513
 Language/Classes/same_name_type_variable_t04: Pass, MissingCompileTimeError, Fail # Issue 14513
 Language/Classes/same_name_type_variable_t07: Pass, MissingCompileTimeError, Fail # Issue 14513
 
-LibTest/math/acos_A01_t01: PASS, FAIL, OK  # Issue 26261 
-LibTest/math/asin_A01_t01: PASS, FAIL, OK  # Issue 26261 
-LibTest/math/atan_A01_t01: PASS, FAIL, OK  # Issue 26261 
+LibTest/math/acos_A01_t01: PASS, FAIL, OK # co19 issue 44
+LibTest/math/asin_A01_t01: PASS, FAIL, OK # co19 issue 44
+LibTest/math/atan_A01_t01: PASS, FAIL, OK # co19 issue 44
 
-LibTest/math/cos_A01_t01: PASS, FAIL, OK  # Issue 26261 
-LibTest/math/tan_A01_t01: PASS, FAIL, OK  # Issue 26261 
+LibTest/math/cos_A01_t01: PASS, FAIL, OK # co19 issue 44
+LibTest/math/tan_A01_t01: PASS, FAIL, OK # co19 issue 44
 
 LibTest/core/Expando/Expando_A03_t01: RuntimeError # Issue 17735
 LibTest/core/Expando/Expando_A03_t03: RuntimeError # Issue 17735
 LibTest/core/Expando/Expando_A03_t04: RuntimeError # Issue 17735
 LibTest/core/Expando/Expando_A03_t05: RuntimeError # Issue 17735
 
 LibTest/core/RegExp/Pattern_semantics/firstMatch_DecimalEscape_A01_t02: Fail # co19 issue 740
 LibTest/core/RegExp/Pattern_semantics/firstMatch_CharacterEscape_A06_t02: RuntimeError # co19 issue 741
 
 LibTest/isolate/SendPort/send_A02_t02: SKIP # co19 issue 493 (not fixed in r672)
@@ skipping 22 matching lines @@
 LibTest/isolate/SendPort/send_A02_t06: Fail # Co19 issue 639
 LibTest/isolate/SendPort/send_A03_t01: Fail # Co19 issue 639
 LibTest/isolate/SendPort/send_A03_t02: Fail # Co19 issue 639
 
 [ $runtime == dartium || $compiler == dart2js ]
 LibTest/async/Future/Future.delayed_A01_t02: Pass, Fail # Issue 15524
 
 ### CHECKED MODE FAILURES ###
 
 [ $compiler != dart2analyzer && $checked ]
-Language/Statements/Return/runtime_type_t04: RuntimeError # Issue 26133
+LibTest/collection/DoubleLinkedQueue/removeFirst_A01_t01: RuntimeError # co19 issue 22
+LibTest/collection/LinkedList/LinkedList_A01_t01: RuntimeError # co19 issue 23
+LibTest/collection/LinkedList/lastWhere_A02_t01: RuntimeError # co19 issue 737